Box body, battery pack and vehicle

Abstract

The invention discloses a box body, a battery pack and a vehicle, the box body comprises: a frame, the frame comprises a frame body, the frame body is provided with a mounting hole for mounting an explosion-proof valve, the frame body is internally provided with cross beams and longitudinal beams connected with the frame body, and the cross beams and the longitudinal beams are arranged in a staggered manner to divide the frame body into a control cabin and a plurality of battery cell cabins; the cover body is arranged at the upper end of the frame; the bottom plate is arranged at the lower end of the frame; wherein a boundary beam on one side, far away from the control cabin, of the frame body is a stepped beam, the upper end surfaces of the cross beams and the longitudinal beams are flush with the stepped surface of the stepped beam, the cover body is connected with the top surface of the stepped beam, so that an exhaust gap is formed between the cover body and the frame, an exhaust hole communicated with the exhaust gap is formed in the stepped surface, and a flow channel is formed in the stepped beam. And the exhaust hole is communicated with the mounting hole through the runner. The stepped surfaces of the stepped beams are flush with the top surfaces of the cross beams and the top surfaces of the longitudinal beams, so that the exhaust gaps are formed in the box body, smoke can be quickly exhausted through the exhaust holes when thermal runaway occurs, and safety is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a box, a battery pack and a vehicle. Background Art

[0002] With the continuous development of electric vehicle technology, battery packs, as the core components of electric vehicles, have received extensive attention for their safety, energy density, and thermal management performance. Although the design of battery packs on the market has met the basic needs of electric vehicles to a certain extent, there is still room for improvement in thermal runaway protection, structural strength, and space utilization. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a box, a battery pack and a vehicle, wherein the box has high overall structural strength, high exhaust efficiency and better safety in thermal runaway protection.

[0004] In a first aspect, the present application provides a box body, which is applied to a battery pack and is characterized by comprising:

[0005] The frame comprises a frame body, the frame body is provided with a mounting hole for mounting an explosion-proof valve, the frame body is provided with a crossbeam and a longitudinal beam connected to the frame body, and the crossbeam and the longitudinal beam are staggered to separate the interior of the box body into a control cabin and a plurality of battery cell cabins;

[0006] A cover body, arranged at the upper end of the frame;

[0007] A bottom plate, arranged at the lower end of the frame;

[0008] Among them, the side beam of the frame away from the control cabin is a step beam, the upper end surfaces of the cross beam and the longitudinal beam are flush with the step surface of the step beam, the cover body is connected to the top surface of the step beam to form an exhaust gap between the cover body and the frame, and an exhaust hole connected to the exhaust gap is provided on the step surface, and a flow channel is provided in the step beam, and the exhaust hole is connected to the mounting hole through the flow channel.

[0009] According to the box body of the present application, an explosion-proof valve is provided to quickly exhaust the gas when the internal pressure of the box body increases abnormally. A step beam is provided, and the step surface of the step beam is made flush with the top surfaces of the cross beam and the longitudinal beam, so that an exhaust gap is formed between the step surface and the top surfaces of the cross beam and the longitudinal beam and the cover body. When thermal runaway occurs in the battery cell, the smoke can quickly flow along the exhaust gap to the exhaust hole for discharge, with high exhaust efficiency and good safety performance.

[0010] According to an embodiment of the present application, the exhaust hole and the mounting hole are staggered along the circumference of the frame.

[0011] According to one embodiment of the present application, a sealing film for sealing the exhaust hole is provided at the exhaust hole.

[0012] According to one embodiment of the present application, flow channels are provided in the side beams, cross beams and longitudinal beams of the frame body and are interconnected. The side beam of the frame body away from the battery cell compartment is the tail side beam. At least one support member is connected between the tail side beam and the cross beam, and the support member is used to support the circuit components in the control cabin.

[0013] Among them, an explosion-proof valve is arranged on the tail cross beam, a flow channel is arranged in the support member, and two ends of the flow channel of the support member are respectively connected with the flow channels of the cross beam and the tail side beam.

[0014] According to an embodiment of the present application, the thickness of the portion where the cover body is connected to the frame body is greater than the thickness of other portions.

[0015] According to one embodiment of the present application, a boss is provided at the upper end of the end surface of the cross beam and the step beam facing the battery cell group.

[0016] According to one embodiment of the present application, the base plate includes:

[0017] A liquid cooling plate is disposed at the bottom of the frame and is sealed to the frame;

[0018] The bottom guard plate is arranged on a side of the liquid cooling plate away from the frame and is sealed with the liquid cooling plate.

[0019] In a second aspect, the present application provides a battery pack, the battery pack comprising:

[0020] A box according to any technical solution in the first aspect;

[0021] The battery cell group is installed in the battery cell compartment, and the end of the battery cell group in the stacking direction is pressed against the cross beam or the step beam;

[0022] The circuit components are located in the control cabin.

[0023] According to the battery pack of the present application, a battery cell compartment and a control compartment are provided to facilitate the installation of battery cell groups and circuit components respectively, so as to facilitate assembly and maintenance. The end of the battery cell group in the stacking direction is abutted against the cross beam or the step beam to ensure the stability of the assembly of the battery cell group. Moreover, because the step surface of the step beam is flush with the top surface of the cross beam, the force on both ends of the battery cell group located between the cross beam and the step beam is more uniform and the stability is higher. An explosion-proof valve is provided to quickly exhaust when the pressure inside the box body increases abnormally. A step beam is provided and the step surface of the step beam is made flush with the top surfaces of the cross beam and the longitudinal beam to form an exhaust gap between the step surface and the top surfaces of the cross beam and the longitudinal beam and the cover body. When thermal runaway occurs in the battery cell, the smoke can quickly flow along the exhaust gap to the exhaust hole for discharge. The smoke exhaust efficiency is high and the safety performance is good.

[0024] According to one embodiment of the present application, the circuit assembly includes a control device and a power distribution device, a precursor connector is provided on the step beam, and a precursor copper busbar for connecting the power distribution device and the precursor connector is located in the exhaust gap.

[0025] In a third aspect, the present application provides a vehicle, comprising a battery pack as in any technical solution in the second aspect, the battery pack being used to provide electrical energy to the vehicle.

[0026] The beneficial effects of the vehicle of the third aspect of the present application are the same as the beneficial effects of the battery pack of the second aspect, and will not be repeated here.

[0027] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 is a schematic diagram of an exploded structure of a battery pack provided in an embodiment of the present application;

[0030] Figure 2 is a schematic diagram of the exploded structure of the box provided in an embodiment of the present application;

[0031] Figure 3 It is a schematic diagram of the exploded structure of the frame provided in the embodiment of the present application;

[0032] Figure 4 It is a schematic diagram of a partial structure of a framework provided in an embodiment of the present application;

[0033] Figure 5 is a schematic diagram of a cross-sectional structure of a step beam provided in an embodiment of the present application;

[0034] Figure 6 is a schematic diagram of the group structure of the battery cell group provided in an embodiment of the present application;

[0035] Figure 7 It is one of the schematic diagrams of the end plate structure provided in the embodiment of the present application;

[0036] Figure 8 This is the second schematic diagram of the end plate structure provided in the embodiment of the present application;

[0037] Fig. 9 It is a schematic diagram of the installation structure of the end plate and the box body provided in an embodiment of the present application;

[0038] Fig.10 yes Fig. 9 The enlarged schematic diagram of point A in the middle;

[0039] Fig.11 is a schematic diagram of the structure of one of the beams provided in an embodiment of the present application;

[0040] Fig.12 It is a schematic diagram of the exploded structure of the insulating board, FPC board, and bar provided in the embodiment of the present application;

[0041] Fig.13 yes Fig.12 A partial enlarged schematic diagram of

[0042] Fig.14 It is a schematic diagram of the structure of the heat insulation board provided in the embodiment of the present application.

[0043] Reference numerals:

[0044] 100. Battery pack;

[0045] 1. Box body; 11. Frame; 111. Frame body; 1111. Step beam; 1111a. Step surface; 1111b. Exhaust hole; 1112. Tail side beam; 1113. Side beam; 112. Support member; 113. Cross beam; 113a. Tail cross beam; 113b. Middle cross beam; 114. Longitudinal beam; 115. Boss; 116. Runner; 12. Explosion-proof valve; 13. Cover body; 131. Mica board; 132. Sealing foam; 14. Liquid cooling plate; 15. Bottom guard plate; 16. Buffer member; 17. Cell compartment; 18. Control compartment; 19. Heat insulation film;

[0046] 2. battery cell group; 21. battery cell; 211. pole; 22. heat insulation board; 221. outer frame; 222. heat insulation layer;

[0047] 3. End plate; 31. Plate body; 311. First end surface; 312. Second end surface; 313. First reinforcing rib; 314. Second reinforcing rib; 315. Third reinforcing rib; 316. Joint support; 317. Rubber stopper;

[0048] 4. Insulating plate; 41. Groove; 42. Through hole; 43. First positioning pin; 44. Second positioning pin;

[0049] 5. FPC board; 51. second positioning hole; 6. bar; 61. first positioning hole; 7. temperature sensor; 8. mica paper; 9. insulation film;

[0050] 10. Circuit components. DETAILED DESCRIPTION

[0051] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0052] Reference below Figure 1-Figure 14 A box according to an embodiment of the present application is described.

[0053] See also Figure 1 , Figure 2 and Figure 3 The box body 1 of the embodiment of the present application is applied to the battery pack 100, and the box body 1 includes a frame 11, a cover body 13 and a bottom plate.

[0054] The frame 11 includes a frame body 111, which is provided with a mounting hole for installing the explosion-proof valve 12. The frame body 111 is provided with a crossbeam 113 and a longitudinal beam 114 connected to the frame body 111, and the crossbeam 113 and the longitudinal beam 114 are staggered to divide the interior of the box body 1 into a control cabin 18 and multiple battery cell cabins 17.

[0055] By providing mounting holes and explosion-proof valves 12, when the internal pressure of the battery pack 100 increases abnormally, the explosion-proof valves 12 can release the pressure in time to avoid structural damage or safety incidents. The cross beams 113 and longitudinal beams 114 are staggered in the frame 111, which not only enhances the structural strength and stability of the frame 11, but also divides the frame 111 into a control compartment 18 and a plurality of battery cell compartments 17, thereby realizing the functional area division inside the battery pack 100 and improving space utilization and safety. A circuit assembly 10 is provided in the control compartment 18 to separate the circuit elements from the battery cells 21, thereby avoiding the risk of short circuits that may be caused by direct contact, and facilitating the maintenance and management of the circuit assembly 10.

[0056] The cover 13 is disposed at the upper end of the frame 11 , and the bottom plate is disposed at the lower end of the frame 11 .

[0057] The cover 13, the bottom plate and the frame 11 cooperate to form a closed box 1, thereby ensuring the safety and stability of the battery pack 2 and the circuit assembly 10 in the battery compartment 17 and the control compartment 18 and protecting them from the influence of the external environment.

[0058] Among them, the side beam of the frame 111 away from the control cabin 18 is a step beam 1111, the upper end surfaces of the cross beam 113 and the longitudinal beam 114 are flush with the step surface 1111a of the step beam 1111, the cover body 13 is connected to the top surface of the step beam 1111 to form an exhaust gap between the cover body 13 and the frame 11, and an exhaust hole 1111b connected to the exhaust gap is provided on the step surface 1111a, and a flow channel 116 is provided in the step beam 1111, and the exhaust hole 1111b is connected to the mounting hole through the flow channel 116.

[0059] The side beam of the frame 111 away from the control cabin 18 is a step beam 1111. Because the step beam 1111 is in contact with the battery cabin 17, it plays a role in pressing the battery cell group 2. The upper end of the step beam 1111 is stepped, and the step surface 1111a is located on the side close to the inside of the box body 1, so that the side with the step surface 1111a is connected to the longitudinal beam 114, and the step surface 1111a is flush with the upper end surface of the cross beam 113 and the longitudinal beam 114, that is, the top surface, and the top surface of the step beam 1111 is higher than the step surface 1111a and is located on the side close to the outside of the box body 1. By connecting the cover body 13 to the top surface of the step beam 1111, an exhaust gap is formed between the step surface 1111a, the top surfaces of the cross beam 113 and the longitudinal beam 114 and the bottom surface of the cover body 13, and smoke can be quickly discharged through the exhaust gap when thermal runaway occurs.

[0060] An exhaust hole 1111b connected to the exhaust gap is provided on the stepped surface 1111a. When thermal runaway occurs, the internal pressure of the box body 1 increases sharply, causing the explosion-proof valve 12 to open to form a pressure difference. The smoke can quickly enter the exhaust hole 1111b through the exhaust gap and be discharged outside the box body 1 through the flow channel 116 and the mounting hole, thereby helping to improve the safety of the battery pack 100.

[0061] According to the box body 1 of the embodiment of the present application, an explosion-proof valve 12 is provided to quickly exhaust the gas when the internal pressure of the box body 1 increases abnormally, and a step beam 1111 is provided, and the step surface 1111a of the step beam 1111 is made flush with the top surfaces of the cross beam 113 and the longitudinal beam 114, so that an exhaust gap is formed between the step surface 1111a and the top surfaces of the cross beam 113 and the longitudinal beam 114 and the cover body 13. When thermal runaway occurs in the battery cell 21, the smoke can quickly flow along the exhaust gap to the exhaust hole 1111b for exhaust, with high exhaust efficiency and good safety performance.

[0062] See also Figure 3 In some embodiments, the inner wall of the box body 1 is provided with a heat-insulating film 19 to improve the insulation and heat-insulating effects.

[0063] See also Figure 3 , Figure 4 and Figure 5 According to some embodiments of the present application, the exhaust hole 1111b and the mounting hole are staggered along the circumference of the frame body 111.

[0064] By staggering the exhaust hole 1111b and the mounting hole, the length of the flow channel 116 between the exhaust hole 1111b and the mounting hole is extended to provide sufficient cooling space for the high-temperature flue gas, thereby reducing the impact of the high-temperature flue gas on the external environment after being sprayed out of the box 1.

[0065] See also Figure 3 In some embodiments, a plurality of exhaust holes 1111b may be provided to improve smoke exhaust efficiency.

[0066] See also Figure 5 In some embodiments, the mounting holes are provided on the outer surface of the step beam 1111. A plurality of mounting holes may be provided and arranged at intervals in the transverse direction to provide for the installation of a plurality of explosion-proof valves 12, thereby improving the smoke exhaust efficiency.

[0067] According to some embodiments of the present application, a sealing film for sealing the exhaust hole 1111b is provided at the exhaust hole 1111b.

[0068] The sealing film is provided to reduce the probability of external impurities entering the battery compartment 17 or the control compartment 18 inside the box body 1 through the exhaust hole 1111b, and reduce the probability of the internal sealed environment being affected by the external environment. In the event of thermal runaway of the battery pack 100, the high-temperature and high-pressure flue gas can quickly break through the sealing film without affecting the exhaust efficiency.

[0069] See also Figure 3 and Figure 5 According to some embodiments of the present application, flow channels 116 are provided in the side beams, cross beams 113 and longitudinal beams 114 of the frame 111 and are interconnected. The side beam of the frame 111 away from the battery cell compartment 17 is the rear side beam 1112. At least one support member 112 is connected between the rear side beam 1112 and the cross beam 113. The support member 112 is used to support the circuit assembly 10 in the control compartment 18.

[0070] The frame 111 can be a hollow structure formed by enclosing multiple side beams, and the cross beams 113 and the longitudinal beams 114 are staggered in the frame 111 and connected to the side beams. Taking the frame 111 including four side beams as an example, the four side beams can be a tail side beam 1112 and a step beam 1111 extending along the transverse direction and spaced apart along the longitudinal direction, and two side beams 1113 extending along the longitudinal direction and spaced apart along the transverse direction, the two side beams 1113 are connected between the tail side beam 1112 and the step beam 1111, wherein the tail side beam 1112 is located on the side close to the control cabin 18, and the step beam 1111 is located on the side close to the battery compartment 17; the cross beam 113 is connected between the two side beams 1113, and serves to separate the control cabin 18 and the battery compartment 17, and the longitudinal beam 114 is connected between the cross beam 113 and the step beam 1111, and serves to separate the two battery compartments 17 spaced apart along the transverse direction.

[0071] The four side beams, the cross beam 113 and the longitudinal beam 114 of the frame 111 can all be profiles, so that they all have sufficient structural strength, and the cavity inside the profile can serve as a flow channel 116 for fluid circulation. And multiple flow channels 116 can be connected at the connection between each beam.

[0072] The space between the rear side beam 1112 and the cross beam 113 is the control cabin 18. The support member 112 is provided to support the circuit assembly 10, thereby improving the installation stability and the overall structural strength.

[0073] An explosion-proof valve 12 is provided on the tail side beam 1112 , a flow channel 116 is provided in the support member 112 , and two ends of the flow channel 116 of the support member 112 are respectively connected to the cross beam 113 and the flow channel 116 of the tail side beam 1112 .

[0074] The explosion-proof valve 12 on the tail side beam 1112 is connected to the control cabin 18. When thermal runaway occurs, part of the smoke in the exhaust gap will enter the exhaust hole 1111b, and the other part will be discharged through the explosion-proof valve 12 on the tail side beam 1112. Because the smoke pressure generated by thermal runaway is high and the speed is fast, part of the smoke entering the exhaust hole 1111b is discharged through the explosion-proof valve 12 on the step beam 1111, and part of it will enter the side beam 1113, the longitudinal beam 114 and the cross beam 113. By setting a flow channel 116 in the support member 112 and communicating with the flow channels 116 of the cross beam 113 and the tail side beam 1112 respectively, so as to facilitate the introduction of the smoke in the total beam of the cross beam 113 to the explosion-proof valve 12 on the tail side beam 1112 for discharge, it plays the role of connecting the front and rear flow channels 116, shortening the exhaust path, and improving the overall exhaust efficiency and exhaust effect.

[0075] According to some embodiments of the present application, the thickness of the portion where the cover body 13 is connected to the frame body 111 is greater than the thickness of other portions.

[0076] In this embodiment, the cover 13 may not be provided with reinforcing ribs, and the strength and durability of the connection can be improved by increasing the thickness of the connection portion between the cover 13 and the frame 111, thereby ensuring the stability of the cover 13 when subjected to external forces. At the same time, reducing the Z-direction dimension occupancy helps to optimize the spatial layout of the battery pack 100 and improve the overall space utilization.

[0077] In addition, a sealing foam 132 may be provided at the lower end of the cover 13 to improve the sealing performance of the battery pack 100, prevent external contaminants such as moisture and dust from entering the battery pack 100, thereby protecting the safety and performance of the battery pack. It can also compensate for manufacturing tolerances, reduce vibration and noise, and provide certain impact protection.

[0078] Exemplarily, the sealing foam 132 may be made of polyurethane or silicone rubber, etc., without limitation.

[0079] In some embodiments, a mica board 131 may be further provided at the bottom of the cover body 13 to further improve the heat insulation and insulating effects of the cover body 13 .

[0080] See also Figure 1 and Figure 2According to some embodiments of the present application, the base plate includes a liquid cooling plate 14 and a bottom protective plate 15. The liquid cooling plate 14 is arranged at the bottom of the frame 11 and is sealed with the frame 11; the bottom protective plate 15 is arranged on the side of the liquid cooling plate 14 away from the frame 11 and is sealed with the liquid cooling plate 14.

[0081] The cover 13 and the frame 11 are also sealed, so that the battery compartment 17 is a sealed space, ensuring that the environment inside the battery compartment 17 is stable and not affected by the external environment, so as to improve the working stability of the battery cell 21 .

[0082] The bottom guard plate 15 is arranged at the bottom of the liquid cooling plate 14 and is sealed with the liquid cooling plate 14. The double-layer seal ensures the space sealing and stability between the bottom guard plate 15 and the liquid cooling plate 14, avoids the interference of external factors on the thermal management system, and avoids the bottom collision from damaging the liquid cooling plate 14. The double-layer seal improves the sealing stability of the battery cell compartment 17 and can more effectively protect the bottom of the liquid cooling plate 14.

[0083] Furthermore, when the bottom guard plate 15 is damaged, the bottom guard plate 15 can be removed alone without removing the liquid cooling plate 14. Moreover, due to the sealed connection between the liquid cooling plate 14 and the frame 11, removing the bottom guard plate 15 will not affect the sealing of the battery cell compartment 17, which makes maintenance convenient and low-cost.

[0084] See also Fig. 9 , Fig.10 and Fig.11 According to some embodiments of the present application, a boss 115 is provided on the upper ends of the end surfaces of the cross beam 113 and the step beam 1111 facing the battery cell group 2 .

[0085] By providing the boss 115 , a more stable pressing force can be provided after the battery cell group 2 is installed in the battery cell compartment 17 , thereby ensuring the stability of the installation of the battery cell group 2 .

[0086] See also Figure 1 , Figure 2 and Figure 3 , an embodiment of the present application also provides a battery pack 100.

[0087] The battery pack 100 includes a box body 1, a battery cell group 2 and a circuit assembly 10 as described in any of the above technical solutions.

[0088] The battery cell group 2 is installed in the battery cell compartment 17 , and the end of the battery cell group 2 in the stacking direction is pressed against the cross beam 113 or the step beam 1111 ; the circuit assembly 10 is arranged in the control compartment 18 .

[0089] In one example, a plurality of cross beams 113 may be provided, and the plurality of cross beams 113 are spaced apart in the longitudinal direction to separate a plurality of battery cell compartments 17 distributed in the longitudinal direction. The cross beam 113 located near the tail is the tail cross beam 113a, and the tail cross beam 113a may separate the battery cell compartment 17 and the control compartment 18. The cross beam 113 located between the tail cross beam 113a and the step beam 1111 may be the middle cross beam 113b, and the middle cross beam 113b is used to separate two battery cell compartments 17 spaced apart in the longitudinal direction.

[0090] A plurality of longitudinal beams 114 may be provided, and the plurality of longitudinal beams 114 are arranged at intervals in the transverse direction to separate a plurality of battery cell compartments 17 distributed in the transverse direction, and the two ends of the longitudinal beam 114 are respectively connected to the rear cross beam 113 a and the step beam 1111 .

[0091] The number of the cross beams 113 is not limited here, and is determined according to design requirements. For example, two cross beams 113 can be provided, namely a rear cross beam 113a and a middle cross beam 113b. The number of the longitudinal beams 114 is also not limited here, and is determined according to design requirements. For example, two longitudinal beams 114 are provided. The two longitudinal beams 114 and the two cross beams 113 separate six battery cell compartments 17.

[0092] The two ends of the battery cell group 2 installed between the rear crossbeam 113a and the middle crossbeam 113b are respectively pressed by the rear crossbeam 113a and the middle crossbeam 113b, and the two ends of the battery cell group 2 installed between the middle crossbeam 113b and the step beam 1111 are respectively pressed by the middle crossbeam 113b and the step beam 1111.

[0093] It should be noted that, because the battery pack 100 of the embodiment of the present application includes the box body 1 of any of the above-mentioned technical solutions, it has the technical features and beneficial effects of the box body 1 of any of the above-mentioned technical solutions, which will not be repeated here.

[0094] See also Figure 2 According to some embodiments of the present application, a plurality of buffer members 16 corresponding to the plurality of battery cell compartments 17 are provided between the liquid cooling plate 14 and the bottom guard plate 15 .

[0095] By arranging a plurality of buffers 16 corresponding to the cell compartment 17 between the liquid cooling plate 14 and the bottom guard plate 15, that is, the plurality of buffers 16 are arranged correspondingly on the lower side of the cell compartment 17 to face the cell group 2, the buffers 16 can absorb vibrations and external shocks and impacts, protect the cell group 2, and provide additional thermal isolation and sealing functions for the cell group 2, thereby improving the comprehensive performance and safety of the battery pack 100. The buffers 16 can be foam or foamed engineering plastics, etc., and the specific materials are not limited here.

[0096] According to some embodiments of the present application, the circuit assembly 10 includes a control device and a power distribution device, a precursor connector is provided on the step beam 1111, and a precursor copper busbar for connecting the power distribution device and the precursor connector is located in the exhaust gap.

[0097] In this embodiment, the side provided with the step beam 1111 is the front side, and the side provided with the tail side beam 1112 is the rear side. The control cabin 18 is located on the rear side of the battery pack 100. The control device and the power distribution device are electrically connected and installed together in the control cabin 18. The electricity of multiple battery cell groups 2 is converged and distributed at the power distribution device.

[0098] When the battery pack 100 is applied to a vehicle with both a front-drive motor and a rear-drive motor, both the front-drive motor and the rear-drive motor of the vehicle need to be powered, so both the front-drive motor and the rear-drive motor need to be electrically connected to the high-voltage part. Therefore, the high-voltage electricity output by the power distribution device located on the rear side needs to be transmitted to the front side through the front-drive copper bus. In this solution, because the lower part of the cover body 13 has an exhaust gap, and the longitudinal beam 114 is connected between the rear cross beam 113a and the step beam 1111 in the longitudinal direction, that is, the front-to-back direction, the front-drive copper bus can be directly arranged in the exhaust gap on the upper side of the longitudinal beam 114. The exhaust gap not only improves the scheduling efficiency, but also provides installation space for the front-drive copper bus, does not occupy the space on the outside and in the height direction, and the overall layout is more reasonable.

[0099] See also Figure 6 and Fig.12 According to some embodiments of the present application, the battery pack 100 also includes an end plate 3 and an insulating plate 4.

[0100] The battery cell group 2 includes a plurality of battery cells 21 stacked in sequence, and a heat insulating plate 22 is provided between two adjacent battery cells 21; an end plate 3 is provided at the end of the battery cell group 2 in the stacking direction, and the end plate 3 is used to cooperate with the box 1 of the battery pack 100 to clamp the battery cell group 2; an insulating plate 4 is covered on the end surface of the battery cell group 2 where the pole 211 is provided, and an FPC (Flexible Printed Circuit) board, a plurality of tabs 6 and a plurality of temperature sensors 7 are provided on the insulating plate 4, the FPC board is respectively connected to the plurality of battery cells 21, the poles 211 of two adjacent battery cells 21 are connected through the tab 6, and the plurality of temperature sensors 7 are arranged at intervals along the circumference of the insulating plate 4 and connected to the corresponding battery cells 21.

[0101] A heat insulation plate 22 is provided between every two adjacent battery cells 21. On the one hand, it can isolate the heat transfer between the battery cells 21 and protect other battery cells 21 in the event of thermal runaway. On the other hand, it is convenient for thermal management and helps improve the stability and safety of the battery pack 100 operation.

[0102] In one example, a rubber layer is provided on the side of the end plate 3 facing the cell group 2 to improve the stability of clamping the cell group 2. Because the cell group 2 is non-modularly assembled, by arranging the end plate 3 in the stacking direction of the cell group 2, the end plate 3 can clamp the cell group 2 along the stacking direction, which is convenient for assembling the cell group 2 on the one hand, and on the other hand, after the cell group 2 is assembled into the box 1, the end plate 3 can cooperate with the box 1 to press the cell group 2 to ensure the stability of the installation of the cell group 2.

[0103] The insulating plate 4 is made of insulating material. By covering the end face of the battery cell group 2 with the pole 211 with the insulating plate 4, an insulating installation environment is provided at the end of the battery cell group 2 with the pole 211. It can be understood that the insulating plate 4 can at least cover the top surface of the entire battery cell group 2. By installing the FPC board, the bar 6 and the temperature sensor 7 on the insulating plate 4, there is no need to separately set insulating parts for each component, and the overall integration is high.

[0104] The poles 211 of two adjacent battery cells 21 are electrically connected through the bar sheet 6. The FPC board extends along the stacking direction of the battery cell group 2 to connect with multiple battery cells 21 to detect the working status of the battery cells 21. The temperature sensor 7 is electrically connected to the FPC board and is arranged at intervals on the insulating board 4 to facilitate the detection of temperature signals at multiple positions on the battery cell group 2 to accurately determine the working temperature status of the entire battery cell group 2. By providing the insulating board 4, during assembly, the FPC board, multiple bar sheets 6 and multiple temperature sensors 7 can be first installed on the insulating board 4, and then the insulating board 4 can be installed on the battery cell group 2, and the components such as the bar sheets 6 and the temperature sensors 7 are made to correspond to the multiple battery cells 21, and then the components such as the bar sheets 6 and the temperature sensors 7 are connected to the corresponding battery cells 21, and the assembly is simple and efficient.

[0105] See also Fig.13 According to some embodiments of the present application, a plurality of grooves 41 are provided on the insulating plate 4 , a through hole 42 for the pole 211 to pass through is provided at the bottom of the groove 41 , and a plurality of tabs 6 are correspondingly installed in the plurality of grooves 41 and connected to the corresponding poles 211 .

[0106] By providing a groove 41 on the insulating plate 4 and installing a plurality of tabs 6 in the grooves 41, the thickness space occupied by the tabs 6 can be reduced, and the cell 21 grouping structure is more compact in the thickness direction of the battery pack 100, optimizing the spatial layout. In addition, the groove 41 can be a contoured groove and is suitable for matching the shape of the tab 6, which facilitates the assembly of the tab 6 in the groove 41 and also plays a certain degree of limiting role on the tab 6. Two adjacent grooves 41 are arranged at intervals to space the installation space of the two tabs 6, reducing the risk of accidental contact and short circuit of the tab 6.

[0107] The bottom of the groove 41 is provided with a through hole 42 for the pole 211 to pass through. When the tab 6 is placed in the groove 41, the tab 6 can contact the end surface of the pole 211, which facilitates the welding connection between the tab 6 and the pole 211. It can be understood that the bottom of the groove 41 can be provided with two through holes 42 arranged at intervals, and the two through holes 42 are provided for the poles 211 of two adjacent battery cells 21 to pass through, so that the tab 6 can connect the poles 211 of two adjacent battery cells 21.

[0108] See also Fig.13 According to some embodiments of the present application, a plurality of first positioning pins 43 are provided on the insulating plate 4 , and at least one first positioning hole 61 is provided on the bar piece 6 , and the first positioning pin 43 is positioned and matched with the first positioning hole 61 .

[0109] By providing a plurality of first positioning pins 43, and providing a first positioning hole 61 on the bar piece 6 that can be positioned and matched with the first positioning pin 43, the positioning and installation of the bar piece 6 is facilitated. The bar piece 6 can be provided with two, three or more first positioning holes 61, and the specific number is not limited here. For example, the bar piece 6 is provided with three first positioning holes 61, and the three first positioning holes 61 are positioned and matched with the three first positioning pins 43 to improve the stability of the positioning of the bar piece 6.

[0110] In the case where the insulating plate 4 is provided with a groove 41, the first positioning pin 43 can be correspondingly arranged in the groove 41, and the groove 41 and the first positioning pin 43 cooperate to limit the position of the bar 6, so as to further improve the installation stability of the bar 6. When installing the bar 6, the bar 6 can be placed in the groove 41 without the need for gluing and other operations, and the installation is simple.

[0111] See also Fig.13 According to some embodiments of the present application, a plurality of second positioning pins 44 are provided on the insulating plate 4, a plurality of second positioning holes 51 corresponding to the plurality of second positioning pins 44 are provided on the FPC board, and the plurality of second positioning pins 44 are positioned and matched with the plurality of second positioning holes 51.

[0112] Multiple second positioning pins 44 can be arranged at intervals along the stacking direction of the battery cell group 2. The multiple second positioning holes 51 on the FPC board correspond to the multiple second positioning pins 44. The FPC board is limited by the second positioning pins 44 passing through the second positioning holes 51, which facilitates installation and improves the stability of the FPC board installation.

[0113] See also Fig.13 According to some embodiments of the present application, a protrusion for supporting the temperature sensor 7 is provided on the insulating plate 4, and the temperature sensor 7 is pressed onto the battery cell 21 by a pressing plate.

[0114] The convex portion is provided to support the temperature sensor 7 , so that the installation of the temperature sensor 7 is facilitated. The temperature sensing probe of the temperature sensor 7 is pressed tightly onto the battery cell 21 through the pressing plate to ensure that the temperature of the battery cell 21 can be accurately determined.

[0115] See also Figure 6 According to some embodiments of the present application, the battery cell 21 grouping structure also includes mica paper 8, which covers the side of the multiple tabs 6 away from the battery cell 21, wherein the mica paper 8 located at the end of the battery cell group 2 in the lateral direction is bent to cover the end face and side face of the battery cell group 2 where the pole 211 is provided.

[0116] The mica paper 8 can provide additional insulation and heat protection, and its light texture satisfies the lightweight design. The mica paper 8 can extend along the stacking direction of the battery cell group 2 to cover the surfaces of multiple bar sheets 6 at the same time, thereby providing a certain degree of protection for the surfaces of the bar sheets 6. Taking the stacking direction of the battery cell group 2 as the longitudinal direction as an example, the two poles 211 of the battery cell 21 are distributed in the transverse direction, and the mica paper 8 located at the end of the battery cell group 2 in the transverse direction can be bent so that the mica paper 8 can cover the surface of the bar sheet 6 and the side of the battery cell group 2 at the same time.

[0117] In one example, the cell group 2 includes multiple rows of cells 21 stacked in the longitudinal direction, and each row may be provided with two cells 21, so that one cell group 2 includes two columns of cells 21 distributed in the transverse direction, and the two poles 211 of the cells 21 are distributed at both ends in the transverse direction on the top surface of the cells 21, so that the poles 211 on the adjacent sides of the two columns of cells 21 are close to each other. Three mica papers 8 may be provided, namely two end mica papers 8 and one middle mica paper 8, and the end mica papers 8 are arranged at the ends of the cell group 2 in the transverse direction to cover the poles 211 of one column of cells 21 on the side away from the other column of cells 21 and the corresponding side surfaces, and the middle mica paper 8 is also arranged to cover the poles 211 on the side of the two columns of cells 21 close to each other.

[0118] By providing the mica paper 8, when thermal runaway occurs in the battery cell 21, the influence of high temperature flue gas on other battery cells 21 can be reduced to ensure that the end faces and side faces of the battery cell 21 are protected, which helps to limit the spread of heat when thermal runaway occurs in the battery and improve the safety of the battery system.

[0119] See also Figure 6 According to some embodiments of the present application, the battery cell 21 grouping structure further includes an insulating film 9 , and the insulating film 9 is covered on the surface of the FPC board facing away from the battery cell group 2 .

[0120] By laying the insulating film 9, the FPC board is electrically insulated from the external space, and when the battery cell 21 has thermal runaway and emits smoke, the FPC board is protected, thereby improving the safety of the battery system.

[0121] By providing the mica paper 8 and the insulating film 9, the high voltage connection part is designed with fireproof and heat-insulating protection, and the low voltage sampling part is designed with insulation, thereby achieving all-round protection for the battery cell group 2.

[0122] See also Figure 6 According to some embodiments of the present application, the battery cell group 2 is provided with a plurality of electrodes 211 distributed along the longitudinal direction, and the insulating plate 4 extends along the longitudinal direction and covers the end surfaces of the plurality of battery cell groups 2 provided with the electrodes 211 .

[0123] By setting up multiple battery cell groups 2 to help increase the power of the battery pack 100 and increase the driving range, the multiple battery cell groups 2 in the battery pack 100 are generally arranged at intervals, so that busbar components are arranged corresponding to different battery cell groups 2. In this application, the insulating plate 4 extends longitudinally to simultaneously cover multiple battery cell groups 2 distributed along the longitudinal direction, and the multiple battery cell groups 2 can be arranged at intervals, wherein the FPC board also extends longitudinally to be electrically connected to the battery cells 21 of the multiple battery cell groups 2 distributed along the longitudinal direction, thereby further reducing the number of parts and improving the overall assembly efficiency and integration.

[0124] See also Fig.14 According to some embodiments of the present application, the thermal insulation board 22 includes an outer frame 221 and a thermal insulation layer 222 .

[0125] The outer frame 221 is clamped between two adjacent battery cells 21 , and the middle of the outer frame 221 is hollow. The heat insulating layer 222 is disposed in the middle of the outer frame 221 , and the thickness of the heat insulating layer 222 is smaller than the thickness of the frame body 111 .

[0126] The outer frame 221 is a hollow frame in the middle. In one example, the outer frame 221 can be a narrow rectangular frame to provide mechanical support and positioning. The hollow outer frame 221 can reduce weight and meet the requirements of lightweight design. The heat insulation layer 222 is filled in the central control part of the outer frame 221 and is directly responsible for heat isolation. The thickness of the heat insulation layer 222 is smaller than that of the outer frame 221. While ensuring a good heat insulation effect, it provides space for the subsequent expansion of the battery cell 21 during charging and discharging.

[0127] The outer frame 221 may also be made of a heat-insulating material, such as a ceramic silicone rubber frame or other material with good mechanical strength, heat resistance and flame retardancy, and the specific material is not limited. The heat-insulating layer 222 may be made of aerogel, composite aerogel, polymer foam or hollow glass microspheres, and the specific material is not limited here.

[0128] In one example, the thickness of the thermal insulation layer 222 may be 2 mm-3.5 mm. For example, the thickness of the thermal insulation layer 222 may be 2 mm, 2.2 mm, 2.5 mm, 2.7 mm, 3 mm, 3.2 mm, 3.5 mm or other values ​​between 2 mm and 3.5 mm, which are not specifically limited here.

[0129] See also Figure 7-10 According to some embodiments of the present application, the end plate 3 includes a plate body 31 , a first reinforcing rib 313 and a second reinforcing rib 314 .

[0130] The plate body 31 extends in the transverse direction and has a first end surface 311 and a second end surface 312 opposite to each other in the thickness direction. The first end surface 311 faces the battery cell group 2 and is used to abut against the battery cell group 2 , and the second end surface 312 faces the box body 1 .

[0131] The plate body 31 is arranged to extend in the lateral direction so as to fit with the end surface of the battery cell 21 to provide sufficient contact area and clamping force. The first end surface 311 of the plate body 31 faces the battery cell group 2 and abuts against the battery cell 21 at the end of the battery cell group 2. The first end surface 311 can be arranged in a plane so as to facilitate full contact between the plate body 31 and the surface of the battery cell 21. The second end surface 312 is arranged opposite to the first end surface 311 and faces the box body 1.

[0132] The first reinforcing rib 313 is disposed on the second end surface 312 and at least partially extends in the transverse direction. The first reinforcing rib 313 is perpendicular to the second end surface 312 .

[0133] By setting at least part of the first reinforcing rib 313 to extend in the lateral direction, the coverage of the first reinforcing rib 313 is increased, and the first reinforcing rib 313 is conveniently in full contact with the box body 1, thereby improving the overall structural strength and stability, and improving the lateral bending resistance of the board body 31. The first reinforcing rib 313 is perpendicular to the second end face 312, and the end of the first reinforcing rib 313 away from the second end face 312 is used to abut against the box body 1. The pressing force applied by the box body 1 can be transmitted to the board body 31 and then to the battery cell group 2 through the first reinforcing rib 313. The vertical arrangement ensures the effective transmission of the pressing force and improves the installation stability of the battery cell group 2.

[0134] The second reinforcing rib 314 is disposed on the second end surface 312 and extends in the transverse direction. The second reinforcing rib 314 is disposed on the lower side of the first reinforcing rib 313 and tilts upward in a direction away from the plate body 31 . The second reinforcing rib 314 is made of an elastically deformable material.

[0135] By setting the second reinforcing rib 314 to extend in the lateral direction, the coverage of the second reinforcing rib 314 is increased, and the second reinforcing rib 314 is in full contact with the box body 1, which can also improve the overall structural strength and stability, and improve the lateral bending resistance of the plate body 31. Among them, the second reinforcing rib 314 is arranged on the lower side of the first reinforcing rib 313 in the height direction of the plate body 31, and the first reinforcing rib 313 and the second reinforcing rib 314 are arranged at intervals to improve the overall structural strength of the end plate 3, and increase the contact area between the end plate 3 and the box body 1, so that there are more transmission paths for the pressing force, higher stability, and stronger pressing force.

[0136] Among them, the second reinforcing rib 314 is set at an angle relative to the second end face 312, and the second reinforcing rib 314 is inclined from the direction away from the plate body 31 to the direction close to the first reinforcing rib 313, that is, it is inclined upward, and the second reinforcing rib 314 is an elastically deformable material. When installing the battery cell group 2 and the end plate 3, the battery cell group 2 and the end plate 3 are clamped first and then installed together into the box body 1.

[0137] In actual implementation, taking the first box body of the box 1 as an example of a hollow structure with an opening at the upper end, it is generally installed downward from the opening of the first box body to the bottom plate along the height direction of the battery cell 21, that is, the height direction of the plate body 31. The second reinforcing rib 314 first contacts the box 1. By tilting the second reinforcing rib 314, the second reinforcing rib 314 can play a guiding role. Through the elastic deformation of the second reinforcing rib 314, more deformation is provided for the adaptive adjustment of the posture of the battery cell 21 entering the box, and the installation is smoother and the stability after installation is higher, and the assembly accuracy is higher. After being fully assembled into the box 1, the first reinforcing rib 313 also abuts against the first box body and is located on the side close to the opening of the first box body, providing a stable clamping force on the upper part of the entire battery cell group 2. The second reinforcing rib 314 elastically abuts against the box 1, and can also provide a stable clamping force on the lower part of the battery cell group 2. In the subsequent expansion process of the battery cell 21, it can be adaptively deformed to ensure the stability of the clamping and the overall structural strength.

[0138] According to the end plate 3 of the embodiment of the present application, the first end surface 311 is used to press against the battery cell 21, and the first reinforcing rib 313 and the second reinforcing rib 314 are arranged on the second end surface 312, so that the first reinforcing rib 313 directly abuts against the wall of the box body 1 to provide sufficient clamping force, and the second reinforcing rib 314 is inclined and elastically deformable. When the battery cell 21 is loaded into the box body 1, more deformation is provided for adaptive adjustment of the posture of the battery cell 21 into the box, and the elastically deformable second reinforcing rib 314 can effectively overcome the influence of the later expansion force of the battery cell 21, and the first reinforcing rib 313 and the second reinforcing rib 314 abut against the box body 1 to provide sufficient clamping force to ensure the installation stability of the battery cell group 2, and the structure is simple and the manufacturing cost is low.

[0139] According to some embodiments of the present application, the first reinforcing rib 313, the second reinforcing rib 314 and the plate body 31 can be integrally formed. The end plate 3 can be made of plastic material and is manufactured by injection molding. By integrally forming the first reinforcing rib 313, the second reinforcing rib 314 and the plate body 31, the manufacturing is simple and the cost is low, and the integrated structure has higher strength, is more stable in use, has good insulation effect, and is light in weight, meeting the requirements of lightweight design.

[0140] According to some embodiments of the present application, the angle α between the second reinforcing rib 314 and the second end surface 312 may be 55°-75°.

[0141] By limiting the angle range between the second reinforcing rib 314 and the second end face 312 , the second reinforcing rib 314 can be effectively deformed during installation to correct the assembly. After assembly, there is sufficient abutment force between the second reinforcing rib 314 and the box body 1 to ensure the pressing effect on the battery cell group 2 .

[0142] Among them, the value range of the angle α between the second reinforcement rib 314 and the second end face 312 is [55°, 75°]. For example, α can be 55°, 60°, 65°, 70°, 75° or other angles between 55° and 75°, which is not specifically limited here.

[0143] See also Fig. 9 According to some embodiments of the present application, a rubber stopper 317 is provided at the lower end of the second end surface 312 to seal the gap between the plate body 31 and the box body 1 .

[0144] It is understandable that when installing the battery pack 2, glue is first applied to the bottom of the box body 1. When the battery pack 2 is pressed downward, the glue will overflow under the pressure of the battery cell 21. By providing a glue stopper 317 at the lower end of the second end surface 312, the glue is prevented from overflowing upward along the gap between the end plate 3 and the box body 1, thereby ensuring the bonding effect of the bottom. The glue stopper 317 can be foam or a sealing strip, etc., and can be fixed to the second end surface 312 by bonding.

[0145] See also Figure 8 According to some embodiments of the present application, a plurality of second reinforcing ribs 314 are provided and distributed in the up-down direction.

[0146] By setting a plurality of second reinforcing ribs 314, the stability of the overall assembly is improved, wherein the plurality of second reinforcing ribs 314 can be arranged at intervals along the height direction of the plate body 31 to increase the coverage of the reinforcing ribs. The number of the second reinforcing ribs 314 can be two, three, or more than three, and the specific number is not limited here. In one example, Figure 8 As shown, two second reinforcing ribs 314 are provided.

[0147] See also Figure 8 According to some embodiments of the present application, a joint support 316 is provided at the upper end of the second end surface 312 .

[0148] The joint support 316 can meet the requirements of the high and low voltage connectors, and is convenient for the installation of the high and low voltage connectors. By arranging the joint support 316 at the upper end of the plate body 31 in the height direction, the position of the joint support 316 is located away from the bottom plate, thereby facilitating the wiring of the high and low voltage connectors, and facilitating the misalignment of the part of the box body 1 used to abut against the end plate 3, avoiding interference between the joint support 316 and the box body 1.

[0149] Taking one end of the terminal post 211 of the battery cell 21 in the height direction of the battery cell 21 as an example, the joint support 316 is located at one end of the plate body 31 close to the terminal post 211.

[0150] Please refer to Figure 8 , according to some embodiments of the present application, at least part of the first reinforcing rib 313 extends in the up and down direction and is connected to the joint support 316.

[0151] By setting at least part of the first reinforcing rib 313 to extend in the height direction of the plate body 31, the bending resistance of the plate body 31 in the height direction is enhanced. Moreover, part of the first reinforcing rib 313 extends transversely and part extends in the height direction, thereby increasing the coverage area of the first reinforcing rib 313 to improve the contact area between the first reinforcing rib 313 and the box body 1 and improve the stability of the abutment. Among them, the part of the first reinforcing rib 313 extending in the height direction is connected to the joint support 316 because the joint support 316 and the part of the box body 1 for pressing the battery cell 21 are arranged in a dislocation manner to ensure that the first reinforcing rib 313 can be in full contact with the box body 1.

[0152] Please refer to Figure 8 , according to some embodiments of the present application, the projection of the first reinforcing rib 313 on the second end face 312 is in a closed frame shape.

[0153] The projection of the first reinforcing rib 313 on the second end face 312 can be in a closed frame shape, which not only has better overall stability, higher structural strength, but also has a large coverage area to ensure full contact between the first reinforcing rib 313 and the box body 1. Among them, the projection of the first reinforcing rib 313 on the second end face 312 can be a rectangular frame, a square frame, or a frame in the shape of a Chinese character 'Ri', a frame in the shape of a Chinese character 'Tian', etc., which is not specifically limited herein. Exemplarily, in Figure 8 , the projection of the first reinforcing rib 313 on the second end face 312 is in a frame in the shape of a Chinese character 'Ri' extending transversely.

[0154] In some embodiments, one end of the first reinforcing rib 313 away from the plate body 31 can be set as a plane to ensure that the first reinforcing rib 313 fits tightly against the surface of the box body 1 and improve the pressing effect.

[0155] Please refer to Fig.10 , according to some embodiments of the present application, the height H1 of the first reinforcing rib 313 in the stacking direction of the battery cell group 2 and the height H2 of the second reinforcing rib 314 in the stacking direction of the battery cell group 2 satisfy:

[0156] H1 < H2.

[0157] It can be understood that the stacking direction of the battery cell group 2 is the thickness direction of the board body 31, that is, the longitudinal direction. Because the second reinforcing rib 314 can be elastically deformed, the height of the second reinforcing rib 314 in the thickness direction of the board body 31 is set to be greater than the height of the first reinforcing rib 313, so that the second reinforcing rib 314 can fully contact the box body 1, ensuring that sufficient clamping force can be provided to improve the overall stability.

[0158] See also Fig.10 According to some embodiments of the present application, multiple groups of joint supports 316, first reinforcing ribs 313 and second reinforcing ribs 314 are provided on the second end surface 312 and are distributed in a transversely spaced manner, and each group of joint supports 316, first reinforcing ribs 313 and second reinforcing ribs 314 corresponds to each other in the up and down directions.

[0159] The first reinforcing ribs 313, the second reinforcing ribs 314 and the joint supports 316 are provided in multiple groups spaced apart along the transverse direction to form gaps between each group, so that the end plate 3 and the battery cell group 2 can be clamped in the gaps by clamping tools during installation to fix the end plate 3 and the battery cell group 2, thereby facilitating the assembly of the battery cell group 2 and the end plate 3.

[0160] The number of the joint support 316, the first reinforcing rib 313 and the second reinforcing rib 314 is not limited here and is designed according to actual needs.

[0161] In one example, two groups of joint supports 316, first reinforcing ribs 313 and second reinforcing ribs 314 are provided. The two joint supports 316 are convenient for installing high-pressure and low-pressure connectors respectively, and the two groups can form a gap for tooling clamping.

[0162] In another example, one end plate 3 may correspond to two battery cell groups 2 distributed along the transverse direction, that is, the ends of the two battery cell groups 2 distributed along the transverse direction are provided with the same end plate 3, and the connector support 316, the first reinforcing rib 313 and the second reinforcing rib 314 may be provided, and four connector supports 316 may correspond to the high-voltage and low-voltage connectors of the two battery cell groups 2 respectively, and three gaps may be formed to improve the stability of the tooling clamping.

[0163] See also Fig.10 According to some embodiments of the present application, a boss 115 is provided at the upper end of the surface of the box body 1 for connecting with the end plate 3 , and the boss 115 abuts against the first reinforcing rib 313 .

[0164] The surface of the box body 1 that is used to abut against the end plate 3 is provided with a boss 115, which protrudes from the surface on which it is located and is directly opposite to the first reinforcing rib 313. It can be understood that the surface of the boss 115 facing the plate body 31 is a plane, so that the first reinforcing rib 313 can stably contact the boss 115 to improve the clamping force. The boss 115 can be set at the upper end, that is, the end away from the bottom plate of the box body 1, so that when the first reinforcing rib 313 is in hard contact with the boss 115, a stable clamping force is provided to the upper end of the battery cell group 2, that is, the end away from the bottom plate, so that the battery cell group 2 is not easy to loosen and has high stability.

[0165] Among them, the second reinforcing rib 314 and the boss 115 can be staggered in the up and down direction, that is, the height direction of the battery pack 100. During the assembly process, the second reinforcing rib 314 can pass through the boss 115 from top to bottom by utilizing the characteristics of elastic deformation. After the assembly is completed, the second reinforcing rib 314 abuts against the surface of the lower part of the beam 113 where the boss 115 is not provided. Because the height of the second reinforcing rib 314 in the stacking direction of the battery cell group 2 is greater than that of the first reinforcing rib 313, the first reinforcing rib 313 and the second reinforcing rib 314 are both kept in tight contact with the beam 113, ensuring that each position in the height direction of the entire end plate 3 applies a stable clamping force to the battery cell group 2.

[0166] The second end surface 312 is provided with a third reinforcing rib 315 , which is provided between the first reinforcing rib 313 and the second reinforcing rib 314 . The third reinforcing rib 315 is located at the lower side of the boss 115 , and the projection of the reinforcing rib and the boss 115 in the height direction of the battery pack 100 has an overlapping portion.

[0167] Among them, the boss 115 can be a rectangular boss 115 extending in the transverse direction, and the third reinforcing rib 315 can extend in the transverse direction. After the assembly is completed, the third reinforcing rib 315 is just located on the lower side of the boss 115, that is, the side facing the bottom plate, so that the third reinforcing rib 315 can be clamped and limited with the lower edge of the boss 115. While the end plate 3 is subjected to the longitudinal clamping force, the limitation in the up and down directions is realized, which can limit and correct the assembly posture and spatial position of the end plate 3, and further improve the stability of the overall structure.

[0168] Further, the spacing between the third reinforcing rib 315 and the boss 115 in the vertical direction can be 1 mm-2 mm, and the overall stability is improved by limiting the spacing between the third reinforcing rib 315 and the boss 115. Exemplarily, the spacing between the third reinforcing rib 315 and the boss 115 in the height direction of the plate body 31 can be 1 mm, 1.2 mm, 1.5 mm, 1.6 mm, 1.7 mm, 2 mm or other values ​​between 1 mm and 2 mm.

[0169] See also Fig. 9 and Fig.10According to some embodiments of the present application, the third reinforcing rib 315 is perpendicular to the second end surface 312, and the height H3 of the third reinforcing rib 315 in the stacking direction of the battery cell group 2 and the height H1 of the first reinforcing rib 313 in the stacking direction of the battery cell group 2 can satisfy:

[0170] H3>H1.

[0171] By setting the height of the third reinforcing rib 315 to be greater than the height of the first reinforcing rib 313 , when the first reinforcing rib 313 is pressed against the boss 115 , the third reinforcing rib 315 can extend to one side of the boss 115 to be limited by the boss 115 .

[0172] See also Fig. 9 and Fig.10 According to some embodiments of the present application, the height H3 of the third reinforcing rib 315 in the stacking direction of the battery cell group 2, the height H2 of the second reinforcing rib 314 in the stacking direction of the battery cell group 2, and the height Ht of the boss 115 may satisfy:

[0173] 1mm≤H2-H3=Ht≤5mm.

[0174] It can be understood that the height of the second reinforcing rib 314 in the stacking direction of the battery cell group 2 is greater than that of the third reinforcing rib 315 , so as to reduce the difficulty of assembly and protect the third reinforcing rib 315 from damage.

[0175] By limiting the height difference between the second reinforcing rib 314 and the third reinforcing rib 315 in the stacking direction of the battery cell group 2, when the second reinforcing rib 314 abuts against the cross beam 113, at least a portion of the third reinforcing rib 315 can be engaged with the boss 115 for position limiting. It should be noted that in the case of H2-H3=Ht, because the second reinforcing rib 314 receives a certain amount of deformation when in contact with the cross beam 113, the third reinforcing rib 315 can play a role of position limiting.

[0176] Among them, the value range of H2-H3 can be [1mm, 5mm]. For example, H2-H3 can be 1mm, 1.5mm, 2mm, 3mm, 4mm, 5mm or other values ​​between 1mm-5mm, which are not specifically limited here.

[0177] Further, in some embodiments, the value range of H2-H3 may be [1mm, 2mm]. For example, H2-H3 may be 1mm, 1.2mm, 1.5mm, 1.7mm, 1.9mm, 2mm or other values ​​between 1mm and 2mm, which are not specifically limited here. By further limiting the height difference between the second reinforcing rib 314 and the third reinforcing rib 315, that is, the height of the boss 115, the space occupied by the component in the longitudinal direction is reduced and the spatial layout is optimized.

[0178] An embodiment of the present application also provides a vehicle, which includes a battery pack 100 according to any of the above technical solutions, and the battery pack 100 is used to provide electrical energy to the vehicle.

[0179] It can be understood that because the vehicle of the embodiment of the present application includes a battery pack 100 as any of the above-mentioned technical solutions, it has the technical features and beneficial effects of the battery pack 100 as any of the above-mentioned technical solutions, which will not be repeated here.

[0180] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0181] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0182] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0183] In the description of the present application, “plurality” means two or more.

[0184] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0185] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0186] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0187] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A box body, applied to a battery pack, characterized in that: include: The frame comprises a frame body, the frame body is provided with a mounting hole for mounting an explosion-proof valve, the frame body is provided with a crossbeam and a longitudinal beam connected to the frame body, and the crossbeam and the longitudinal beam are staggered to separate the interior of the box body into a control cabin and a plurality of battery cell cabins; A cover body, arranged at the upper end of the frame; A bottom plate, disposed at the lower end of the frame; Among them, the side beam of the frame body away from the control cabin is a step beam, the upper end surfaces of the cross beam and the longitudinal beam are flush with the step surface of the step beam, the cover body is connected to the top surface of the step beam to form an exhaust gap between the cover body and the frame, the step surface is provided with an exhaust hole connected to the exhaust gap, the step beam is provided with a flow channel, and the exhaust hole is connected to the mounting hole through the flow channel.

2. The box according to claim 1, characterized in that: The exhaust hole and the mounting hole are staggered along the circumferential direction of the frame.

3. The box according to claim 1, characterized in that: A sealing film for sealing the exhaust hole is arranged at the exhaust hole.

4. The box according to claim 1, characterized in that: The side beams, the cross beams and the longitudinal beams of the frame are all provided with flow channels and are interconnected. The side beam of the frame away from the battery compartment is the tail side beam. At least one support member is connected between the tail side beam and the cross beam, and the support member is used to support the circuit components in the control compartment; Wherein, an explosion-proof valve is provided on the tail cross beam, a flow channel is provided in the support member, and two ends of the flow channel of the support member are respectively connected with the flow channels of the cross beam and the tail side beam.

5. The box according to any one of claims 1 to 4, characterized in that: The thickness of the portion where the cover body is connected to the frame body is greater than the thickness of other portions.

6. The box according to any one of claims 1 to 4, characterized in that: The upper ends of the cross beam and the step beam facing the end surfaces of the battery cell group are provided with bosses.

7. The box according to any one of claims 1 to 4, characterized in that: The bottom plate comprises: A liquid cooling plate, disposed at the bottom of the frame and sealed to the frame; A bottom guard plate is arranged on a side of the liquid cooling plate away from the frame and is sealed and connected to the liquid cooling plate.

8. A battery pack, characterized in that: include: The box as claimed in any one of claims 1 to 7; A battery cell group is installed in the battery cell compartment, and an end of the battery cell group in the stacking direction is pressed against a crossbeam or a step beam; The circuit assembly is arranged in the control cabin.

9. The battery pack according to claim 8, characterized in that: The circuit assembly includes a control device and a power distribution device. A precursor connector is provided on the step beam. A precursor copper busbar for connecting the power distribution device and the precursor connector is located in the exhaust gap.

10. A vehicle, characterized in that: Comprising a battery pack as claimed in claim 8 or 9, the battery pack is used to provide electrical energy to the vehicle.

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